Original Paper

Biology and Fertility of Soils

, Volume 49, Issue 6, pp 627-635

Mitigation of nitrous oxide emissions from paddy soil under conventional and no-till practices using nitrification inhibitors during the winter wheat-growing season

  • Yuchun MaAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University
  • , Liying SunAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University
  • , Xiaoxu ZhangAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University
  • , Bo YangAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University
  • , Jinyang WangAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University
  • , Bin YinAffiliated withState Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
  • , Xiaoyuan YanAffiliated withState Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
  • , Zhengqin XiongAffiliated withJiangsu Key Laboratory of Low Carbon Agriculture and GHG Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University Email author 

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Abstract

The net effect of no-till techniques on nitrous oxide (N2O) emissions is inconsistent and poorly quantified in comparison to conventionally tilled farming. This study assesses N2O emissions and yields from paddy fields during the wheat-growing season under conventional and no-till farming, as well as mitigation of N2O evolution using dicyandiamide and chlorinated pyridine (CP) as nitrification inhibitor (NI). Both tillage practices and NIs significantly (P < 0.01) affected cumulative N2O emissions and yields. In comparison to conventional tillage, the cumulative N2O emissions under no-till farming were increased by 8.2–19.3 % and the water-filled pore space was higher on most days. Relative to no-tillage, the conventional tillage averagely increased the wheat yield by 6.0 % and reduced yield-scaled N2O–N emission by 44.5 %. The two NIs averagely increased the wheat yield by 9.7 % and reduced yield-scaled N2O–N emission by 67.7 %. The treatment with CP produced the highest yield with the lowest N2O emissions, thus leading to the lowest yield-scaled N2O–N emission (0.15–0.17 kg N2O–N t−1 grain yield) under both tillage practices.

Keywords

Nitrous oxide No tillage Wheat Nitrification inhibitor Agronomic N use efficiency